Other Technologies

Mechanical Ventilation Heat Recovery (MVHR)

Breathe fresh air and reduce energy bills with MVHR

Mechanical Ventilation Heat Recovery (MVHR) is a whole house ventilation system that removes stale air from your property and replaces it with clean air.

It reduces condensation and keeps your property smelling fresh.

You won't need to open windows, so MVHR also prevents heat loss and reduces the cost of heating. Biosun Energy can help homeowners, self-builders and industry professionals' source and install Mechanical Ventilation Heat Recovery systems.

 Mechanical ventilation heat recovery (MVHR)
Mechanical ventilation heat recovery (MVHR).

How does MVHR work?

Modern buildings are well insulated to prevent heat loss. This also restricts natural ventilation and can lead to condensation, damp and unhealthy air. You can open windows, but this leads to heat loss.

You can use a vent or extractor fan, but they are largely ineffective and can also lead to heat loss. MVHR solves this problem by extracting stale air from rooms like bathrooms and kitchens.

A heat exchanger filters the stale air, recovers the heat, and pumps fresh air back into your property. The result? Low condensation. Healthy air. And a fresh-smelling home.

Underfloor heating heat exchanger unit
The heat exchanger unit.

Advantages of MVHR

  • Reduce condensation – stale air to healthy air, automatically.
  • Remove odours – no more nasty odours – just a constantly clean, fresh smell.
  • Warmer home – no need for trickle vents, extractors, and open windows.
  • Low maintenance – just clean the filters every few months.


There is a growing demand, especially in airtight buildings for cooling during the summer.

This can be achieved by fitting a fan-coil within the MVHR system and linking it to the heat pump. In the summer the heat pump can use the heating buffer as a cooling buffer and supply cool water to the fan coil unit to provide cool air into ducted rooms.

Why Biosun Energy?

We’ve partnered with MVHR experts to offer MVHR and cooling solutions for new build properties.

Our partners can also provide a complete eco retrofit service, including air-tight insulation and rainwater harvesting.

Airflex Pro semi-rigid 'radial' ducting.

Let's talk about your project

If you have a project in mind or are thinking of installing renewable energy, please contact us for an initial informal chat.